Characterization of copper–cementite nanocomposite produced by mechanical alloying

Carvalho, P.A.; Fonseca, I.; Marques, M.T.; Correia, J.B.; Almeida, A.; Vilar, R.

doi:10.1016/j.actamat.2004.10.042

Cited by 30 publications

(9 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A recent report has pointed out that a similar effect is observed in the grain growth while annealing fine-grained metals. [27,28] However, the suppression of grain growth due to the phosphorus addition was weaker than that due to cementite particles, since the 10-hour-annealed 15C-P showed a larger grain size than the 30-hour-annealed 45C. Discussed third are the effects of dislocation strengthening.…”

Section: A Effects Of Strengthening Mechanismsmentioning

confidence: 94%

Fatigue Strength of Ultrafine Ferrite-Cementite Steels and Effects of Strengthening Mechanisms

Furuya

Matsuoka

Shimakura

et al. 2007

Metall Mater Trans A

View full text Add to dashboard Cite

To investigate the effects of precipitation, solid-solution, and dislocation strengthening on fatigue strength, fatigue tests were conducted on a series of ultrafine ferrite-cementite steels, the ferrite grains of which were smaller than 1 lm. To investigate the effect of precipitation strengthening by carbon addition, which increased the number of cementite particles in the ultrafine ferrite-cementite steel, several steels containing 0.15 pct (in mass pct) carbon and others containing 0.45 pct were studied. The effect of solid-solution strengthening was investigated by adding 0.1 pct phosphorus to some steels. Fatigue tests were also conducted on annealed versions of the ultrafine ferrite-cementite steels, to investigate the effect of dislocation strengthening, since the as-rolled versions were work hardened, due to warm-caliber rolling to refine the ferrite grains. The resultant tensile strength of the lab-prepared ultrafine ferritecementite steels ranged from 721 to 1048 MPa. All the lab-prepared ultrafine ferrite-cementite steels showed high fatigue-limit ratios (fatigue-limit/tensile strength) exceeding 0.5. The fatigue strength of the ultrafine ferrite-cementite steel was higher than that of ferrite-pearlite steel, and matched that of tempered martensite steel. In conclusion, all of these strengthening mechanisms satisfactorily improved the fatigue strength of the ultrafine ferrite-cementite steels. The ultrafine ferrite-cementite steel showed stable fatigue strength, due to its microstructure being both ultrafine and uniform.

show abstract

Section: A Effects Of Strengthening Mechanismsmentioning

confidence: 94%

Fatigue Strength of Ultrafine Ferrite-Cementite Steels and Effects of Strengthening Mechanisms

Furuya

Matsuoka

Shimakura

et al. 2007

Metall Mater Trans A

View full text Add to dashboard Cite

show abstract

“…This type of behaviour has also been observed in other systems produced by intense straining. [22][23][24][25] The present results indicate that the Cu2C nanocomposite is in a high energy nonequilibrium state even after annealing.…”

Section: Resultsmentioning

confidence: 83%

Transmission electron microscopy study of copper–carbon nanocomposite

Carvalho¹,

Fonseca²,

Marques³

et al. 2006

Materials Science and Technology

Self Cite

View full text Add to dashboard Cite

A Cu210C nanocomposite has been synthesised by high energy milling of elemental powders, followed by annealing at 873 K. Phase identification and microstructure characterisation have been carried out with transmission electron microscopy. Copper grain size ranged from 10 to 120 nm for the as milled material and from 10 to 150 nm after annealing. No graphite reflections could be detected by electron diffraction in either the as milled or annealed samples. Nevertheless, both conditions contain clusters of carbon of ,10 nm, which could be of benefit for sliding wear applications. The lattice parameter measured after milling is compatible with a carbon solubility in the copper matrix ,0 . 1 at.-%. The synthesised material showed excellent structural stability at 873 K, which is proposed to be dependent on solute drag effects resulting from boundary segregation. In fact, no grain boundary pinning by nanoparticles has been detected while a decrease in lattice parameter occurred during annealing.

show abstract

“…The heat treatments and SPS consolidation resulted in modest grain growth. This result is remarkable since exposure of nanostructured pure copper to such high temperatures, even for short periods, leads to considerable microstructural coarsening and deterioration of the mechanical properties [15][16][17]. Fig.…”

Section: Methodsmentioning

confidence: 99%

Production of Cu/diamond composites for first-wall heat sinks

Nunes

Correia

Carvalho³

et al. 2011

Fusion Engineering and Design

Self Cite

View full text Add to dashboard Cite

Due to their suitable thermal conductivity and strength copper-based materials have been considered appropriate heat sinks for first wall panels in nuclear fusion devices. However, increased thermal conductivity and mechanical strength are demanded and the concept of property tailoring involved in the design of metal matrix composites advocates for the potential of nanodiamond dispersions in copper. Copper-nanodiamond composite materials can be produced by mechanical alloying followed by a consolidation operation. Yet, this powder metallurgy route poses several challenges: nanodiamond presents intrinsically difficult bonding with copper; contamination by milling media must be closely monitored; and full densification and microstructural homogeneity should be obtained with consolidation. The present line of work is aimed at an optimization of the processing conditions of Cu-nanodiamond composites. The challenges mentioned above have been addressed, respectively, by incorporating chromium in the matrix to form a stable carbide interlayer binding the two components; by assessing the contamination originating from the milling operation through particle-induced X-ray emission spectroscopy; and by comparing the densification obtained by spark plasma sintering with hot-extrusion data from previous studies.

show abstract

Characterization of copper–cementite nanocomposite produced by mechanical alloying

Cited by 30 publications

References 37 publications

Fatigue Strength of Ultrafine Ferrite-Cementite Steels and Effects of Strengthening Mechanisms

Fatigue Strength of Ultrafine Ferrite-Cementite Steels and Effects of Strengthening Mechanisms

Transmission electron microscopy study of copper–carbon nanocomposite

Production of Cu/diamond composites for first-wall heat sinks

Contact Info

Product

Resources

About